Intent to implement: use GitHub Actions for tests

### Is your feature request related to a problem? Please describe.

I noticed that CI runs must be triggered manually by contributors. I was wondering if we can make this process more optimal by utilizing GitHub Actions, which support Linux, macOS and Windows too.

### Describe the solution you'd like

I'd be willing to work on a PR that introduces CI workflows using GitHub Actions, so these can be triggered automatically for every PR.

### Describe alternatives you've considered

There are many more CIs available, but nowadays GitHub Actions seems to be a to-go solution for any GitHub repository because of great functionalities and very tight integration.

### Additional context